My game and soundtrack are 100% free -- there's over 50 great songs on the 4-hour soundtrack, plus I have more fun trance/ambient music on http://cynicmusic.com for free --- you can stream it on my website anytime with the built in player.

I'd love to hear from you! Please contact me if you use my music, I'd love to see your project and give you a shoutout on my website! Much of the music on http://pixelsphere.org you may use for free in your game if you contact me for permission and join my mailing list: http://cynicmusic.com/email.html

I also made 40 Sonic The Hedgehog remixes in trance/ambient style you can stream them or download all of them free: http://sonic.tcpmusic.com/